The present invention relates generally to image forming equipment, e.g. a laser printer of the type which includes a photoconductive (PC) drum and an associated charge roller. The invention is disclosed in exemplary embodiment as a laser printer incorporating a cleaner element with an electrical potential to sufficiently charge contamination particles on the PC drum to electrically repel from a charged surface, such as the charge roller.

 
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> Tunable external cavity laser with adjustable cavity length and mode-hop suppression

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